Missing Authentication for Critical Function in MikroTik RouterOS - CVE-2026-67277
Published: September 6, 2026
Vulnerability identifier: #VU147167
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-67277
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose kernel memory and cause a denial of service.
The vulnerability exists due to missing authentication for a critical function in the RouterOS btest connection handling when accepting a related btest connection before primary-session authentication completes. A remote attacker can start an IPv4 UDP test with random-data disabled and use the unchecked packet-size interval to disclose kernel memory and cause a denial of service.
Affected software
MikroTik RouterOS
How to mitigate CVE-2026-67277
Install security update from vendor's website.
MikroTik RouterOS - addressed in versions 6.49.21, 7.23.4, 7.24.2